EV Artificial Sound Switching Between Accelerator And Torque Cues
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Solution Overview
Problem
In electric vehicles with an electric motor, the driving sound is minimal, leading to a gap between the vehicle's operation and the audio system, causing discomfort to the driver when the required torque is independent of the accelerator operation.
Innovation Solution
An electric vehicle system that generates artificial sound in conjunction with the required torque, independent of the accelerator operation, using a control device to simulate driving characteristics and output sound through speakers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If artificial sound is generated based on accelerator operation amount, then the driver can enjoy sound reflecting driving state, but a gap appears between driving state and artificial sound when control function activates
Solution Approach 1:
The patent dynamically switches between two modes: first mode generates artificial sound based on accelerator operation amount when control function is inactive, while second mode generates artificial sound based on required torque when control function is active. This dynamic adaptation ensures consistency between artificial sound and actual driving state regardless of control mode, resolving the contradiction between ease of operation and reliability.
2Productivity
If electric motor is used as drive source, then vehicle achieves efficient driving, but driving sound becomes minimal causing driver discomfort
Solution Approach 1:
The patent introduces artificial sound generated by a sound generator as an intermediary between the electric motor's operation and the driver's sensory experience. The artificial sound is controlled to reflect the required torque and driving state, providing auditory feedback that compensates for the minimal natural sound of electric motors, thus enhancing driver comfort without affecting driving efficiency.
Data Source
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AI summary
An electric vehicle (100) having an electric motor (4F, 4R) as a drive source includes one or more processors (102) configured to generate an artificial sound in conjunction with required torque for a drive system of the electric vehicle (100) and to output the artificial sound from a speaker (21) mounted on the electric vehicle (100). In a first mode, the one or more processors (102) are further configured to generate the artificial sound in conjunction with first required torque being independent of an operation amount of an accelerator operation device (22) of the electric vehicle (100).